for a constant control of the set nominal value as proportional regulator working without auxiliary energy. Nominal value infinitely adjustable between 50 and 300 mbar. Nominal value can be locked and be read off from the outside at any time. With hidden isolation and ball valve for draining and filling.

Valve body, bonnet and regulator housing made of bronze. Inner parts made of brass resistant to dezincification (DZR). O-rings and diaphragm made of EPDM.